I suppose one problem I see here, is thinking that a "yes" vote represents equality. I certainly don't see a majority homosexual votership being given an official voice on the legitimacy of heterosexual marriage.
This whole question of SSM fundamentally undermines equality in my eyes. The question should be; firstly, do two consenting adults have a right to commit to each other through marriage and enjoy the benefits that commitment allows? Secondly, do we adhere to the notion of gender equality, that neither man nor woman shall face discriminiation based on their gender? If these two questions are answered yes, it is an agreement to conditions that effect everyone equally, without the need to segregate anyone into a sub-category.
The club should've remained silent on the vote itself, other than to say it supports true equality.
I have no idea what point you are trying to make and I work in this area. How on earth is a vote for yes not a vote for equality? It is literally a vote to ensure that legal rights and protections operate on all adults equally.